libaps2 v0.4

Companion firmware version 2.12

Enhancements:

• software trigger support
• fleshed out MATLAB driver
• play_waveform command line program
• documentation
• DAC BIST support for data-integrity testing

Bug-fixes:

• DAC FIFO's are adjusted for stability (#12)
• single channel waveform mode on Ch B is supported (#11)